Detection of coronary stenosis with myocardial contrast echocardiography using regadenoson, a selective adenosine A 2A receptor agonist

Dai-Trang (Elizabeth) Le, Thanjavur Bragadeesh, Yan Zhao, Yue Gang Wang, Daogang Zha, Sanjiv Kaul

    Research output: Contribution to journalArticle

    5 Scopus citations

    Abstract

    Aims: Regadenoson is comparable to adenosine in pharmacologic radionuclide stress tests but has not been studied with stress myocardial contrast echocardiography. This study assessed the haemodynamic profile and ability of regadenoson, a novel selective A 2A receptor agonist, to detect coronary artery stenosis during myocardial contrast echocardiography. Methods and results: Myocardial contrast echocardiography was performed to measure myocardial blood volume, myocardial blood flow velocity, and total regional myocardial blood flow before and after administration of regadenoson (5 μg kg -1, 10 s bolus) in 10 open-chest dogs with mild-to-moderate coronary stenosis that was not flow limiting at rest. Regadenoson decreased blood pressure but did not change heart rate. It increased coronary blood flow significantly (P <0.05) for 30 min, which was attenuated in proportion to coronary stenosis severity. Whereas myocardial blood volume maximally increased by 0.5-0.75-fold in the control region, it did not change in the region supplied by the nonflow limiting stenosis. Perfusion defects were visually and quantitatively detectable for as long as 10 min after administration of regadenoson. No arrhythmias were noted with regadenoson either prior to or during myocardial contrast echocardiography. Conclusion: Regadenoson can be used as a vasodilator stress agent with myocardial contrast echocardiography to detect the presence of physiologically significant coronary stenosis. The optimum time for image acquisition was 3-10 min after drug administration. Published on behalf of the European Society of Cardiology. All rights reserved.

    Original languageEnglish (US)
    Pages (from-to)298-308
    Number of pages11
    JournalEuropean Heart Journal Cardiovascular Imaging
    Volume13
    Issue number4
    DOIs
    Publication statusPublished - Apr 2012

      Fingerprint

    Keywords

    • Myocardial contrast echocardiography
    • Regadenoson
    • Stress testing

    ASJC Scopus subject areas

    • Cardiology and Cardiovascular Medicine
    • Radiology Nuclear Medicine and imaging

    Cite this